How To Fix Amd Cpu = 1?

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Question

I have installed maverick on a amd phenom 2 x4 850 on a Gigabyte 970A-D3. At first I remained frozen image after 20 seconds. after using cpu = 1 was solved. But this way is slow and I only used 1 of the 4 cores. How could I fix it?Thanks in advance.